On Wed, May 29, 2013 at 7:18 AM, Greg Troxel <[email protected]> wrote:

>
> Tac Tacelosky <[email protected]> writes:
>
> > Are there any punctuation restrictions on tags?  In particular, commas
> > could be problematic for storing a list of tags as a single string.
>
> I am not clear on a formal grammer, but it seems clear that tag names
> and non-numeric tag values should be limited to a-z, 0-9, and _, with
> the leading character being a-z, and ; denoting multiple values.  This
> is fundamentally about communicating to computer programs.
>

Usually, but there exists exceptions such as service=drive-through instead
of the expected service=drive_through or even service=drivethrough:
http://wiki.openstreetmap.org/wiki/Tag:service=drive-through
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